On the generation of multipartite entangled states in Josephson architectures

TL;DR

This paper presents a scheme to generate multipartite entangled states in Josephson flux qubits with fixed frequencies, using tunable inductive coupling and a mediator qubit, aiming to minimize decoherence.

Contribution

It introduces a novel method for creating multipartite entanglement in Josephson qubits with fixed eigenfrequencies and controllable coupling, enhancing coherence.

Findings

Successful generation of W states in three or more qubits.

Use of a mediator qubit for sequential entanglement.

Minimized decoherence through fixed eigenfrequencies.

Abstract

We propose and analyze a scheme for the generation of multipartite entangled states in a system of inductively coupled Josephson flux qubits. The qubits have fixed eigenfrequencies during the whole process in order to minimize decoherence effects and their inductive coupling can be turned on and off at will by tuning an external control flux. Within this framework, we will show that a W state in a system of three or more qubits can be generated by exploiting the sequential one by one coupling of the qubits with one of them playing the role of an entanglement mediator.